OTFS - Orthogonal Time Frequency Space
Anton Monk, Ronny Hadani, Michail Tsatsanis, Shlomo Rakib

TL;DR
OTFS is a novel 2D modulation technique that maps information onto the Delay-Doppler domain, transforming the wireless channel into a stable, non-fading environment to enhance MIMO and 5G performance.
Contribution
Introduces OTFS, a new modulation scheme that converts the wireless channel into a stable domain, enabling improved capacity and pilot multiplexing for Massive MIMO systems.
Findings
OTFS converts fading channels into non-fading, stable interactions.
All QAM symbols experience the same channel in OTFS.
OTFS achieves near-capacity throughput scaling with MIMO order.
Abstract
In this paper we introduce a new 2D modulation technique called OTFS (Orthogonal Time Frequency & Space) that transforms information carried in the Delay-Doppler coordinate system to the familiar time-frequency domain utilized by traditional modulation schemes such as OFDM, CDMA and TDMA. OTFS converts the fading, time-varying wireless channel into a non-fading, time-independent interaction revealing the underlying geometry of the wireless channel. In this new formulation, all QAM symbols experience the same channel and all Delay-Doppler diversity branches of the channel are coherently combined. Reference signal multiplexing is done in the time-independent Delay-Doppler domain, achieving high density pilot packing, which is a crucial requirement for Massive MIMO. Regardless of the Doppler scenario, OTFS enables approaching channel capacity through linear scaling of throughput with MIMO…
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Taxonomy
TopicsPAPR reduction in OFDM · Advanced Wireless Communication Technologies · Wireless Communication Networks Research
